1. Talimogene laherparepvec pseudolymphomatous reaction mimicking metastatic melanoma
- Author
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Ania Henning, Doreen M. Agnese, and Catherine Chung
- Subjects
CD20 ,education.field_of_study ,Pathology ,medicine.medical_specialty ,Histology ,biology ,business.industry ,Melanoma ,medicine.medical_treatment ,Population ,Dermatology ,Immunotherapy ,medicine.disease ,Pathology and Forensic Medicine ,Oncolytic virus ,biology.protein ,medicine ,Stage IIIC ,Histopathology ,Talimogene laherparepvec ,education ,business - Abstract
Talimogene laherparepvec (TVEC) is a genetically modified herpes simplex virus-1 approved as an intralesional oncolytic immunotherapy for the treatment of advanced melanoma. Cutaneous reactions at the site of injection may mimic recurrent or progressive melanoma; histopathological findings have included chronic granulomatous dermatitis, neutrophilic dermatitis, lymphocytic dermatitis, and pigment incontinence. We report a 39-year-old male with metastatic stage IIIc melanoma treated with TVEC with clinical regression of melanoma lesions that later developed pink nodules at sites of prior injection. Histopathology demonstrated a nodular mononuclear infiltrate that stained strongly and diffusely with CD45 and CD20 with a surrounding rim of CD3-positive T-cells. Immunoglobulin gene rearrangement was negative for a clonal B-cell population. To our knowledge, this is the first report of a pseudolymphomatous reaction mimicking recurrent melanoma after TVEC therapy.
- Published
- 2021
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